Nature and Significance of Metamorphism in Gold Concentration, Bousquet Township, Abitibi Greenstone Belt, Northwest Quebec [microform]

Nature and Significance of Metamorphism in Gold Concentration, Bousquet Township, Abitibi Greenstone Belt, Northwest Quebec [microform] PDF

Author: William Edward Stone

Publisher: National Library of Canada

Published: 1988

Total Pages: 882

ISBN-13: 9780315432802

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Similar REE abundances of garnet-bearing and andalusite-bearing wall rock to gold concentrations suggests manganese metasomatism and relative enrichment in silica and aluminum in the manner of an argillic alteration, respectively. This along with andesite and rhyolite host rock and associated gold and pyrite with small base metal content, suggests initial concentration of gold in an epithermal-like hydrothermal system by boiling of a metamorphogenic fluid liberated through devolatilization of rock subsided toward synvolcanic magma during the low pressure metamorphism. Gold was subsequently moved into dilatent and discordant fractures during plutonism.